changed c++ code to use attributes and skip vector multiplication for non-comfortable vectors
numDeriv now only imported

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mptinr@135 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
snowfall functions "imported" using snowfall:: (avoids CRAN warnings).

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mptinr@136 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
select.mpt() automatically takes names via match.call.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mptinr@137 edb9625f-4e0d-4859-8d74-9fd3b1da38cb